<template>
  <div class="app">
    <h3>我是App组件</h3>
    <Suspense>
      <template v-slot:default>
         <Child></Child>
      </template>
       <template v-slot:fallback>
         <h3>请稍等,加载中...</h3>
      </template>
    </Suspense>
  </div>
</template>

<script>
//import Child from './components/Child.vue' //静态引入
import { defineAsyncComponent } from 'vue';
const Child = defineAsyncComponent(()=>import('./components/Child.vue')) //异步引入
export default {
  name: "App",
  components: {
    Child
  }
};
</script>
 <style>
 .app{
   background-color: gray;
   padding: 10px;
 }
 </style>


